Circuit card assembly conduction converter

• US 5,161,092 A
• Filed: 07/02/1991
• Issued: 11/03/1992
• Est. Priority Date: 07/02/1991
• Status: Expired due to Term

• Current Assignee: OL Security LLC (Intellectual Ventures LLC)
• Original Assignee: Hughes Aircraft Company (Rtx Corporation)
• Inventors: Smith, William A., Brodie, Eugene L.
• Primary Examiner(s): Tolin, Gerald P.
• Application Number:
  US07/724,695
• Time in Patent Office: 490 Days
• Field of Search: 361/382, 361/386-389, 361/395, 361/399, 361/400, 361/405, 361/415, 165/46, 165/104.15, 165/80.3, 165/185, 174/16.3, 174/52.2, 174/252, 211/41, 357/81
• US Class Current: 361/705
• CPC Class Codes: H05K 2201/0133 Elastomeric or compliant polymer elastomeric conductor H05K2201/0314
• CPC Class Codes: H05K 2201/0999 Circuit printed on or in housing, e.g. housing as PCB; Circuit printed on the case of a component; PCB affixed to housing
• CPC Class Codes: H05K 2201/10598 Means for fastening a component, a casing or a heat sink whereby a pressure is exerted on the component towards the PCB
• CPC Class Codes: H05K 3/0061 onto a metallic substrate, e.g. a heat sink heat sinks for electric apparatus H05K7/20
• CPC Class Codes: H05K 3/3447 Lead-in-hole components H05K3/3415 takes precedence
• CPC Class Codes: H05K 7/20545 Natural convection of gaseous coolant; Heat transfer by conduction from electronic boards

Abstract

The thermal mounting plate has a pocket therein which contains dielectric elastomer. The pins on the pin side of the circuit card assembly engage in the elastomer to conduct heat from the components through the pins and elastomer into the thermal mounting plate. The thermal mounting plate mounts into a cooled card box for heat removal.

Claims

1. An assembly for providing conductive cooling, said assembly including a circuit card which has been previously designed to be convectionally cooled, said circuit card being of the type having a first side upon which electronic components are mounted and a second side from which pins of said electronic components extend through corresponding openings in said circuit card and are soldered to solder pads on the second side of the circuit card, said assembly comprising:

a thermal mounting plate of high thermal conductivity material, said thermal mounting plate having a raised peripheral flat rim conforming to the outside border of said circuit card, said peripheral rim defining a pocket of said thermal mounting plate;

a layer of electrically nonconductive, thermally conductive elastomeric material filling said pocket of said thermal mounting plate up to said rim;

fastener means coupling the outside border of the second side of said circuit card against the perimeter flat rim of said thermal mounting plate, said perimeter rim being of a height above the surface of said mounting plate such that said pins extend into said layer of elastomeric material but do not extend to the surface of said thermal mounting plate; and

means coupling said mounting plate to a heat removal means.

2. An assembly for providing conductive cooling for a circuit card as recited in claim 1 wherein said means coupling said thermal mounting plate to a heat removal means comprises:

a flange on a least one end of said mounting plate, said flange being extending outside said rim and raised above said rim by the thickness of said circuit card.

3. An assembly for providing conductive cooling for a circuit card as recited in claim 2 further including:

a cold plate; and

means thermally coupling said flange to said cold plate.

4. An assembly for providing conductive cooling for a circuit card as recited in claim 3 further including:

heat sink exchanger means for removing heat from said cold plate.

5. An assembly for providing conductive cooling for a circuit card as recited in claim 1 wherein said circuit card has holes disposed around its periphery and said fastener means includes:

said rim having pads, said pads having holes corresponding to the holes in said circuit card, fasteners received in said respective holes.